Air-lift pump.



Ris. MILLER.V

AIR LIFT PUMP. APPLIoATIoN FILED P21345', 1911.

Patntea Aug. 20, 1912.

.narran sfraras ramena ernten.

FRANCIS S. MILLER,

OF INDIANAPOLIS, INDIANA, ASSIG-NOR'TO HARRIS AIB PUMP.

COMPANY, 0F INDIANAPOLIS, INDIANA, A CORPORTIGN OF INDIANA'. y

AIR-Lira." rui/ir.

To all whom y'it may concern:

Be it known that I,` FRANCIS Indianapolis, State of Indiana, have invented a new ing .is a specification.

The object of my i an air lift pump of increased eiiciency.

The accompanying drawing illustrateg my invention. i

Inthe drawing, 10 indicates a main tulbular body formed at its lower end 11 to receive a watersupply pipe and formed at its upper end 12 to receive the lower end of a water delivery pipe. Formed to one side of the upper end of the main body 10 is a-descending air passage 13 which, as is common in this type of structure, delivers into the main body 10 through an upwardly curved tube 111 which lies in a somewhat enlarged portion of the main body and is formed at its delivery end to receive an air nozzle 15. lNozzle 15 is provided with an air chamr 16 which communicates with the passage 13 and this air chamber 16 is developed into a hollow nozzle 17 whicheisJ .annular in cross section and has the vertical section shown in the drawing, the vertical section being such as to contract the air stream and direct all portions thereof tcward the axis 'of the structure, the point of' convergence a nozzle contractor 18 having a globular head and conical upper end which lies with in the delivery end of the chamber 16 and combining shell 23 which is contracted at` is so formed as to assist in the'production of an annular stream of air substantially conical in` Jform with apex uppermost. Surrounding tlie delivery end of the air inozzle thus formed, and supported lingers 19aextending from the nozzle 15, is an annular mixingI shell 19 with its larger end downward and' lying below-the delivery end of the air nozzle, forming an -annular water 4passage 21 around the air nozzle and also forming an annular water 'passage 22 between tlIe"miXing shell and the main body 10. 'Arranged in the 'main body 10 above the upper end ofthe mixing shell 19 is a an intermediate point 24 in its length, this shell delivering .to `the end 12 of main body specificatie-adriaan Patent.

nvention -is to produce Patentesaug, ao, asia.

Appiication mea February 15;'1911. semi une. 608,855.

Y y .,1'0. In order to adapt the nozzle to diier- S. MILLER, a citizen of the United States, residing'atin tlie county of Marion andv and` useful Air-Lift Punippof which-the follow-- -eiit .depths of submergence and lift, -the he-ad 18 is carried by 'a stem Q5 which is threaded into a cross bar 26 extending across: chamber 16.

. In operation of pumps of this type 1 have found that the most eilicient results are to be produced not .by the formation of separate air plugs in lthe delivery pipe but, instead, by a thorough admixture of the air under' pressure and velocity with the water in which the apparatus is submerged and that this admixture produces the best results when the air is thoroughly broken up into small bubbles in v,the water column. By the use of my improved nozzle, wherein -there is an annularconical upwardly converging stream of air, I iind that various portions of the air stream act upon eachl other in such way as to thoroughly break `up the air stream into very small bubbles which first draw vthe water upwardly throughthe annular passage 21 and then, passing' from' the upper end of theamixing shell 19,' draw a further supply of water from the main body 10 and .project it upwardly through the combining shell 23.

The restrictor head 17, tapered in iront and curved inthe rear, permits the air passage to be unrestricted practically `to the discharge end of the nozzle, where the `air seems to glance od the curved rear endof the head and then rebound, at increasing velocity lon account of the diminishing cross section `of the air-Y passage, `from the yinner surface of the nozzle 17. Because oi' this' movement, it this explanation be the. true one, and certainly because of the construction whatever the explanation, the air is mixed most intimately with the' portion of the wat-er in the mixing shell 19. This mixture is so intimate that the air is in the form of very small bubbles'in`the water.'

The mixture of air and water in the mixing nate slugs of air andwater usual in'punips l of this general character, the air and water issuing from the pump as a sort of emulsion.

It has been -found in practice that by the use' of yt is construction th`e lifting power of the pump, is greatly increased.

I claim as my invention:

1. In an air lift pump, an air nozzle having an upwardly converging annular wall, a restrictor head mounted within the delivery end of vsaid annular wall, said rest-rictor head being tapered above and curvedly rerduced below .an intermediate portion. of

I maximum diameter, and an vupwardly converging mixing shell of larger diameter than and surrounding -the delivery, en'd of said L 1 tion gof maximum diameter.

2. Inan airflift pump, an air nozzle havingfan .upwardly converging annular wall and a restrict'or headlmounted within the delivery' e11,d ;,of` said'an'nular wall, said reystrictor'head1being vtapered above and curvedly reduced below an intermediate por- 5 #13.' Inanzair lift pump, the combination of aneirtnozzle" havmg an upwardly convergillg Wall, anlupwardly tapered restrictor vhead,c11Yedin the rear and located within the delivery 'end of said nozzle, an upwardly converging mixing shell surrounding .and

'spaced from the upper end of said nozzle e surrounding'and spaced from the upper end ."bottom, the upper end of said nozzle being of said nozzle andv open at both top and intermediate between the ends of the mixing shell, and a water tube surrounding and lspaced from the nozzle and the mixing shell.

I 5. .In an air lift pump, the combination of an air nozzle having an upwardly converging'wall, an upwardly tapered restrictor head located within the delivery end of said nozzle, an upwardly converging mixing shell surrounding and spaced from the upper end of said nozzle and open at both top and strictor head being tapered ,above and curvedly reduced below an intermediate portion of'maximum diameter, the maximum v diameter of the restrictor head being greater than the `diameter of t-he air nozzle outlet and being at a part of the restrictor head which is below such outlet.

7 In an air lift. pump, an airy nozzle havingan inwardly converging annular wall, and a restrictor head mounted within the delivery end of said annular wall, said restrictor head being substantially globular with a conical upper end.

8. In an air lift pump, an air nozzle hav'- ing an inwardly converging annular wall and a stem mounted within said wall and having its'forward free end enlarged to form a restrictor head taperedin front and curved in rear.

9. In an air lift pump, an air nozzle having an inwardly converging annular wall and a stem mounted within said wall and having its forward free end enlarged to form a restrictor head tapered in front and curved in rear, and a mixing shell open at front and rear and surrounding said nozzle.

vIn witness whereof, I have hereunto set my hand and seal.

FRANCIS s. MILLER.

Witnesses: e

FRANK A. FAHLE, MAY LAYDEN'. 

